BOSTON--(BUSINESS WIRE)--OncoPep, Inc. today announced that the Company has initiated a Phase 1/2a clinical trial evaluating PVX-410, a multi-peptide therapeutic cancer vaccine, in patients with smoldering multiple myeloma, an asymptomatic precursor of multiple myeloma, which is an incurable cancer of the plasma cells. PVX-410 is composed of four proprietary, synthetic peptides that target specific antigens found on the surface of multiple myeloma cells. Target enrollment for this study is 13 patients. The trial will assess the safety and tolerability of the cancer vaccine, and early-stage data from the study are expected in late 2013.